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Fair Value Measurements - Additional Information (Detail) (USD $)				1 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2010	Apr. 30, 2010 April 2010 Warrants	Jun. 30, 2010 Warrant Liability	Dec. 31, 2011 Contingent Consideration Liabilities	Dec. 31, 2010 Contingent Consideration Liabilities	Dec. 31, 2011 Fair Value, Inputs, Level 3	Dec. 31, 2011 Fair Value, Inputs, Level 3 Contingent Consideration Liabilities	Dec. 31, 2010 Fair Value, Inputs, Level 3 Contingent Consideration Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash flows discounted rate		16.00%
Changes in fair value of contingent consideration liability				$ 9,500,000	$ (843,000)	$ (2,197,000)		$ (800,000)	$ (2,200,000)
Estimated fair value of contingent liability							0
Common stock shares outstanding as converted basis	10,913,873		7,038,210
Reclassification of warranty liability into equity				$ 12,000,000